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  1. Stem cells: What they are and what they do - Mayo Clinic

  2. Stem Cell Basics | STEM Cell Information - National Institutes of Health

  3. Stem Cells: Types, What They Are & What They Do - Cleveland Clinic

  4. Stem cell | Definition, Types, Uses, Research, & Facts

  5. Stem cells: Sources, types, and uses - Medical News Today

  6. Stem cell - Wikipedia

  7. What Are Stem Cells? - Stanford Medicine Children's Health

  8. A beginner’s guide to understanding stem cells - The Conversation

  9. Explainer: What is a stem cell? - Science News Explores

  10. Introduction to Stem Cells | STEM Cell Information